102021988 has 6 divisors (see below), whose sum is σ = 178538486. Its totient is φ = 51010992.

The previous prime is 102021977. The next prime is 102021989. The reversal of 102021988 is 889120201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 80138304 + 21883684 = 8952^2 + 4678^2 .

It is not an unprimeable number, because it can be changed into a prime (102021989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752745 + ... + 12752752.

Almost surely, 2^102021988 is an apocalyptic number.

It is an amenable number.

102021988 is a deficient number, since it is larger than the sum of its proper divisors (76516498).

102021988 is a wasteful number, since it uses less digits than its factorization.

102021988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25505501 (or 25505499 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 102021988 is about 10100.5934479119. The cubic root of 102021988 is about 467.2664440064.

The spelling of 102021988 in words is "one hundred two million, twenty-one thousand, nine hundred eighty-eight".